.nav {
  display: flex;
  justify-content: space-between;
  position: relative;
  overflow-x: scroll;
  /* 不让选择文字 */
  -webkit-user-select: none;
  -moz-user-select: none;
  -ms-user-select: none;
  user-select: none;
}
.nav::-webkit-scrollbar,
.animation::-webkit-scrollbar {
  display: none;
}
.nav #a {
  padding: 10px 0;
  text-align: center;
  flex: 1;
  min-width: 100px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  cursor: pointer;
}
.bottonNav {
  position: absolute;
  bottom: 0;
  transition: all 0.2s;
}
